Punch and die



April 1943- I G. H. MILLER I 2,317,791

' I PUNCHES AND DIE 7 I Filed April 4. 1942 Patented Apr. 27, 1943UNITED STATES PATENT ()FFICE PUNCH AND DIE George Henry Miller,Dearborn, Mich. Application April 4, 1942, Serial No. 437,667

1 Claim.

My invention relates to punches and dies.

are

First. To provide a punch that can be tried for alignment with the diebefore the punch retainer is bored or reamed to size. This is anadvantage when there is more than one punch in the same retainer,corrections for perfect alignment are made by tilting the reamer andreaming to finished size.

Second. To provide a quick change punch whose shank or body has neithera protruding head or recess to keep the punch in the retainer whilestripping itself from the piece on which work was done. The punch isheld in the retainer by a pressed fit.

Third. To provide a shank or body that can be used inverted, that is,the working end of the punch could be at either end of the shank orbody. Similar numerals refer to similar parts throughout the differentviews. The term shank or body used herein refers to that part of thepunch between the line 3 and the backing plate 4 in Figure 1.

I attain these objects by the punch illustrated in the accompanyingdrawing in which Figure 1 is a vertical section, and Fig. 2 is a plan,showing two methods of removing the punch I from the punch retainer I6.

Figure 2a is a view of a modification of the punch holder.

Fig. 3 shows an arrangement for removably mounting large punches.

Fig. 4 is showing the punch shank or body used inverted, the working endbeing on the small end. The retainer is removed when the punch ischanged.

The punch I in Figure 1 has a tapered shank or body 2, that is, thediameter next to the backing plate 4 being maller than the diameter atline 3, the flat 5 is only put on punches whose working end 6 is otherthan round and then the punch is held in position by the key I, thewedge ejector 8 is used to remove the punch and is actuated improvementsin The objects of my invention by a blow on pin 9, or by the cone screwIll as is shown in position in the die retainer I I in Figure l. Thepunch I may also be removed by the direct action of pin 9 on chamfer I2through slot I3 in the retainer plate I6, as shown in Figure 2. Thedotted lines I4 show the proposed maximum diameter of the working end 6of the punch in proportion to the shank or body 2 which will stripitself from stock whose thickness is that of the diameter shown bydotted outline I4.

The die I5 in Figure 1 has a tapered outside diameter and is used hereto show one method of removing the die by the cone pointed screw Ill. Ido not make any claims for the die I5. I recommend a taper of 4 inch perfoot on the shank or body of the punch.

Fig. 2A shows a punch I having a tapered shank or body 2 seated in apunch retainer I6 and removable-by means of a wedge ejector 8 the sameas in Fig. 1, except that the wedge ejector 8 is actuated by the conepointed screw IS, in the same manner as the die shown in the lowerportion of Fig. 1.

It will be seen that I have provided a punch having a tapered shank orbody'mounted in a simple retainer arrangement such that a punch can beperfectly aligned with a die and retained by a pressed fit so that it isalways tight in the retainer and yet may be easily and quickly removed,reground and replaced in its previous operative position relative to therest of the die and thereby providing for saving many hours of labor indie and punch construction and upkeep.

I claim:

In combination, a punch tool having a tapered shank with the small enddisposed remotely from the tool, a retainer plate having a taperedaperture suitable for snugly receiving the tapered tool shank forsupporting the tool in extended relation from the retainer plate, abacking plate on the side of the retainer plate remote from the tool, awedge ejector having tapered surfaces on both opposite ends, a guiderecess slidably supporting said wedge ejector with one tapered endadjacent the small end of the tapered tool shank for wedging between thetool shank and the backing plate to eject the tool, an actuator apertureextending from the guide recess through the retainer plate, saidactuator aperture having internal threads, and an actuator screw in saidaperture having a conical inner end for engaging the other tapered endof the wedge ejector to force it into wedging engagement with the end ofthe tool shank.

GEORGE HENRY MILLER.

